In a fully turgid call, which one of the following would be zero

Options

A. Suction pressure
B. Osmotic pressure
C. Wall pressure
D. Turgor pressure

Answer

To solve the question regarding which pressure would be zero in a fully turgid cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Turgidity**: A fully turgid cell is one that is filled with water, causing the cell membrane to press against the cell wall. This pressure is essential for maintaining the structure and rigidity of the plant cell.

2. **Identifying the Types of Pressure**:
- **Osmotic Pressure**: This is the pressure required to prevent the flow of water into the cell due to osmosis.
- **Wall Pressure**: This is the pressure exerted by the cell wall against the cell membrane when the cell is turgid.
- **Suction Pressure**: This is the pressure that draws water into the cell.
- **Turgor Pressure**: This is the pressure exerted by the fluid (water) inside the cell against the cell wall.

3. **Equilibrium in a Turgid Cell**: In a fully turgid cell, the osmotic pressure and wall pressure are balanced. This means that the osmotic pressure pushing water into the cell is equal to the wall pressure pushing back against the cell membrane.

4. **Water Potential**: The water potential of a cell is determined by the equation:
\[ \text{Water Potential} = \text{Osmotic Pressure} - \text{Pressure Potential} \]
In a fully turgid cell, the water potential becomes zero because the osmotic pressure equals the wall pressure.

5. **Conclusion**: Since the water potential is zero, the suction pressure, which is a component of water potential, is also zero. Therefore, in a fully turgid cell, the suction pressure is zero.

### Final Answer:
In a fully turgid cell, the suction pressure would be zero.

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